Improvement in combined stop-cocks, check-valves, and blow-offs



UNITED STATES PATENT OEErcE,

ELBEIDGE c. cusnnve, OE oswEGo, NEW vonk.

IMPROVEMENT IN COMBINED STOP-COCKS, CHECK-VALVES, AND BLOW-OFFS.

Specification forming part of Letters Patent No. 138,077, dated April 22, 1873; application filed February l, 1873.

To all whom it may concern:

Be it known that I, ELBRIDGE G. GUsH- ING, of Oswego, in the county of Oswego and State of New York, have invented a new and Improved Combined StopCock, Check-Valve, and Blow-Odl Cock, of which the followingis a specification The invention consists in a combined stopcock, check-valve, and blow-off cock, as hereinafter described and subsequently claimed.

Figure 1 is a sectional elevation of my irnproved stop-cock, check-valve, and blow-ofi cock taken on the line x w of Fig 2, and Fig. 2 is a horizontal section taken on the line y y.

Similar letters of reference indicate corresponding parts.

A is the shell of an ordinary stop-cock, with the inlet-pipe connection B arranged near the bottom and the outlet-pipes C and C near the top. D is the hollow plug-cock, having an opening, E, into the lower part, coinciding with the inlet-pipe B, and two others, F F', in the upper part, coinciding with the outlet-pipes C C. It also has a diaphragm, G, between the said openings, dividing the hollow space into two chambers, H and I. A passage is formed through this diaphragm, and a valve-seat arranged on the upper side of it, on which a check-valve, J, is iitted to close downward. This valve has a tubular extension, K, upon the upper side, in which the smooth part L of the stem M its in such manner as to form a guide forV the valve. This stem screws out and in through the screw N in the top of the plug, having a handwheel, O, on the top, and it has a shoulder, P, on the lower end to be forced down on the top of the valve to fasten it closed. This shoulder will also limit the. amount of the pening of the valve in case it be desirable to The pipe connection C is the one to be connected with the boiler, and C is the one to be used for the blow-off. When the water is to be forced into the boiler, the plug will be adjusted, as shown in the drawing, by which the passage is opened from the inlet-pipeB up through the valve and pipe C into the boiler, and the escape is closed; but when the boiler is to be blown off opening F is turned around to pipe G and F to C, which opens an escape through C, chamber I, and C.

This device will be very useful in connection with the force-pump or water-supply for boilers, tanks, reservoirs, and the like, as a oheck-valve and stop-valve for checking the back flow of water into the pump while in operation, or to stop the iiow in either direction altogether; also where a blow-loft' cock is required, and can be provided in this combined form much cheaper than the cost of furnishing each separately.

The connections G C' and the passages F F are made large as the size of the cock will allow, and larger than are needed for the size of the inlet-pipe below, to facilitate the blowing off.

Having thus described my in vent-ion, I claim as new and desire to secure by Letters Patent The shell A having the inlet, outlet, and blow-ofE-pipe connections B C C', the hollow plug D having openings E F F, valve-seat G, and chambers H I, and the valve J, having rotary handle M, all constructed, arranged, and combined substantially as and for the purpose described.

`ELBRIDGE G. CUSHIN G.

Witnesses:

E. C. PERKINS, FRED. W. EAMES. 

